浅析以玉米芯为反硝化碳源和反应介质的生物反应器去除地下水中硝酸盐

近年来随着工农业的快速发展,水体中硝酸盐的污染已引起人们的普遍关注。针对受硝酸盐污染的水,生物反硝化脱氮技术由于具有高效低耗的特点被广为研究。生物反硝化脱氮工艺中,使用固体材料作为反硝化细菌的碳源及生长载体可望解决传统工艺中所存在的外加碳源难以控制的弊端,给反硝化细菌创造一个稳定、易于维护的生存环境。采用室内实验装置,研究了以玉米芯为反硝化碳源和反应介质的生物反应器对于污水中硝酸盐的去除效果及其影响因素。实验结果表明,玉米芯具有较好的反硝化效果,且最终有很少NO2-的积累;反应过程中无NH4+积累。随着反硝化过程的进行,pH值不断下降。

Recently, with the development of industry and agriculture, nitrate pollution of water body has been prevalently considered by people. As an effective and energy-saving means of controlling nitrate pollution of water, biological denitrification techniques have been studied intensively in recent years. Biological denitrification with solid carbon source can avoid the adding difficulties of carbon source in traditional biological denitrification processes, and create a steady and maintainable environment for denitrifying bacteria as well. In this research, corncob was investigated as the sole carbon source as well as biofilm carrier to remove nitrate from wastewater in static laboratory reactors. The experimental results indicated that effective removal of nitrate was readily achieved in corncob, with little accumulation of nitrite and none produce of ammonia, pH was decreased with the denitrification process.